Electric steam-heating system.



A. P. BATCHELDER. ELECTRIC STEAM HEATING SYSTEM. APPLICATION FILED SEPT. 23, 190B.

Patented Mar. 5, 1912.

" asar. Barcnnmiui, or en-amuse new omea'ssmuon TO GENERAL ELEQTRIC COMPANY, aoonromlrqn or- NEW YORK. I

"2T0 (if/1 atlas-lameness.

. anaemic steam-amuse SYSTEM.

Be it known that- I, Asa F. Ba' 'nnmm, a citizen of the United .States, residing at Schenectady, I in the, county of Schenectady, State of- New York,have-invented certain new and useful-Improvements in' Electric Steam-Heating This Invention relates to appliancesfor generating low pressure steam *for heating purposes. S 1nce t.he..heating {agent 1s ;an electr c current transmitted alongthe (filled pipe constituting the steam generator. the

invention is especiallyapplicabl tb the heating of-electric railway-"carsel*- -In order to produce sl-iflieie'nt resistanceto:

the passage of the electric current, the pipe must be of considerable length. But this in-' volves, onthe other handea: higlrpressure to force the water through the. generator. owing to the hydraulic friction to be over-' come. which is proportional to the length of the pipe and the square of the velocity. In order to avoid this. I divide the pipe into sections and connect section independently of the others. each having its own 1nlet and delivery connections. The several delivery p pes are all connected to one. steam.distributingmain.-

The, sections of the generator are. however. all connected 111 series electrically. so that the. heating etl'ect is the same as though thev constituted one. cimtinuous pipe. although the frictional resistance water is very much less. I f

The accompanying drawing is a diagrammatic illustration of a steam heating system embodying nrvinvention.

For the sake of perspicuity.l have illus trated more than the mere generator. in orderthat its place in the system may he clearly understood. The control circuits and devices are substantially the same as. are set. forth in the patent of Hermann Lemp, No. 919,366.

My improved steam generator-is com-- posed of .a plurality of sections-of tubing. preferably bent or'coiled into compact form. For convenience. l have shown four sections 1, 2. 3, 4. arranged in a tier and each containing the same length: of tu-bing coiled in the same. manner; Each section has its own supply pipe 5'in' which is aninsulatin length or oint 6. .The delivery pipes 7 0 V" is pec tl ciztion oi il'let ters'ratent. "f ja u imon med September 2a, 100;. Serial in). 455,164.

Systems, of which the fol- -lowingisa specificatio by a. conductor 13. brought from a supply main 15 and con- .(mnnection 17 therefrom. rent will thus traverse the sections in series. them in parallel; so* that the water will be pumped through each .f

'part'tllebpipe system given unit of, length is but; one-sixteenth of Patented ar. 5, 191 2.

thesectionsilfandfi are connected to a pipe preferably of the same size of pipe as the sections.

sections are separated from each other by interposed insulating material 12. Thus the the other hand, the tubing composing the sections is all in series electrically, the supply pipes of sections 2 and 3 being connected A conductor 14 is nected to the inlet of section 1. the' circuit being completed through a conductor L6, running to the steam main anda ground The heating curand the electrical resistance of the entire for heating the tubing and its contents.

W ater-is supplied to the generator by a pump driven b a, motor 18. I prefer to use a. multiple-cylinder pump. having one cylinder. '19 for each section of the generator.

mach cylinder drawing \vater fronra tank 20. The pump plungers may allhe driven by a double'rrailk-shaft 3t. geared to the motor. Each cylinder delivers one quarter of the total quantity required by the generator. lf'all the water had to be forced through the entire length of the pipe itwould flow through a conduit having four times the length of that provided by my arrangement. The velocity would. therefore, have to be four times as great in order to deliver at given quantity of water ina given time. The friction of water flowing in a full pipe of a given unit of lengtlris proportional to the square of the velocity. Therefore, in my the Y friction 'in any that in a single pipe; and since each pipe is but one-fourth 'the length of the single pipe the pressure required in my system is but one-sixtyfourth of that required in a continuous pipe generator of the same size.

The temperature of the steam at the delivery end of the generator is the same in 8f'which delivers steam to the steam main 9.

Sections 3 and 4 are similarly connected-by 'a pipe 10.witl 1 the steam-main 9."which is In eachof the pipes 8. 10 is an insulating joint .11, which forms the subject;

-'-'of a separate application for patent; The

'80 length of tubing in said sections is available -eaeh section exactly compensates for the erator-{but requires a 'inm-hless expenditure sections of piping each having, 'a separate- In accordance with the'pruvisions of the but Idesire to have it understood that the- 'b v-Letterslatent of the United State's, is-

. I I I I buth systems, be :ause the low-Welocrty 1n shortervlength It hasbeen found in practice. that my multiple-section generator gives the same output of steam as a continuous-pipe genapparatus shown is'only illustrative, and that. the invention ean be carried out by other means. v 4

' What I claim as new and desire to secure.

'1. The combination with aj-plurality of inlet, of a eonmmn main into whiehlsaid sections deliver, a separate pumping device-g sending-an eleetrie.current through said sections in series. I i v 2. The eembmatlon w th a. plurality. of

iseetions' of piping each having a separateconnected \v t-h earh inlet, and means for iulet, -pf a emmnon maim of the same s'ized piping, mt avhmh saulw seet1ons dehver,

pumping mechanism eonneet'ed with said 'iil'- lets. insulating joints separating said"sec-.' .tions from theipumping meehanism and the iii-livery main. and an electrid cire'uit'in which said seetimis'areemlnectedgiil'series.

3'. The em'nhinatimi with-a plurality of HUUilQllh' of piping; all (if-tl1e'saine-'s1ze,. lenglh and number-of lwnds, inf a multiplee vlinder pump having its ey'linders' eon net-tedrespectively-with said seetions, and

an electric circuit ink-hiding said seetions in series.

In witness \'hereof. I have hereunto set my hand this 26th day of September, 1908.

a .\S.\' F. 'BATGHELDER 1 'ilnesses:- l

Bnxaulix '3. NULL, Blaneamcrl). '(KHJJ'IY, 3 

